The only real official docs are the Troubleshooting ones, which I pretty much copied from this thread and should definitely try to update. I don't think there's anyone with the time or inclination to write technical documentation at the Pi Foundation- specially not when they can always count on us re-sellers to do it for them. They're busy folks with plenty of better things to do!
Honestly, what's detailed above is about as official as it gets, unfortunately I'm also short on time so it doesn't get updated as frequently as it should!